query_question: The figure shows (a) and (b) two sections, (a) is a circle of rectangular holes, (b) a square u and v with circular holes are the spindle of the center. There are four answers about the moment of inertia L. and I, among which the correct is<image 1>
options: ['l(a)>1,(a);l(b)=l(b)', 'l.(a) >L(a);l(b)>l,(b)', 'l.(a) >2(a);l(b)>l,(b)', 'l.(a) >L(a);l(b)>2,(b)']
demo_question_list: What do satellite 1, 2, 3 separately monitor in <image 1>?
  A. Earth's energy balance, Earth's water cycle, Earth's surface
  B. Earth's water cycle, Earth's energy balance, Earth's surface
  C. Earth's surface, Earth's water cycle, Earth's energy balance
  D. Earth's surface, Earth's energy balance, Earth's water cycle
  
  Answer with the option's letter from the given choices directly. In the illustrated circuit, the consumption power of load RL is 72W. If the transformer voltage ratio k=5, the effective value of the transformer is U1 ()<image 1>
  A. equal to 120V
  B. equals to 4.8V
  C. and equals to 0.6V
  D. cannot be calculated
  
  Answer with the option's letter from the given choices directly. There is a device with a current actual value of P=8000 yuan and an estimated residual value of LN=800 yuan. The first year's The operating cost of the equipment is Q=600 yuan, and the annual deterioration increment of the equipment is equal. The annual deterioration value $\lambda $= four hundred Yuan, then the economic life of the equipment is () years.<image 1>
  A.  7.5
  B.  7.5
  C. 8
  D.  6
  
  Answer with the option's letter from the given choices directly. The moisture content of a non self weight collapsible loess sample is w=15.6%, and the relative density (specific gravity) of soil particles is dr=2.70,Mass density $\rou$= 1.60g/cm3, liquid limit wL=30.0%, plastic limit wP=17.9%, pile foundation design needs to be based on Check the design parameters for the liquid index under saturation state, and the liquid index of the sample is closest when its saturation reaches 85%Which of the following options? ()<image 1>
  A. 0.85
  B.  0.92
  C. 0.99
  D. 1.06
  
  Answer with the option's letter from the given choices directly.